亚热带米老排和杉木人工林土壤呼吸季节动态及其影响因子

doi:10.11707/j.1001-7488.20140802

Abstract

Abstract:

We investigated monthly soil respiration (R_s) and the affecting factors under 19-year-old Mytilaria laosensis and Cunninghamia lanceolata plantations replanted in a C. lanceolata woodland slash in subtropical China. The results showed that the average annual R_s rates were 2.95 μmol CO₂·m^-2 s^-1 under M. laosensis plantations and 2.37 μmol CO₂·m^-2 s^-1 under C. lanceolata plantations. The Q₁₀ value was 1.83 under M. laosensis plantations, which was significantly lower than 1.99 under C. lanceolata plantations. The R_s rates exhibited distinct seasonal patterns under both M. laosensis plantations and C. lanceolata plantations and were dominantly controlled by the soil temperature, accounting for 77.0% and 81.6% of monthly variation, respectively. Linear regression analysis showed that R_s was significantly correlated with annual litter biomass, fine root biomass, soil organic carbon content, light fraction organic carbon content, microbial biomass carbon concentration and dissolved organic carbon concentration (P<0.05). Stepwise regression analysis showed that litter biomass and microbial biomass carbon concentration were the most important affecting factors of R_s. Our results suggest that differences of R_s in different vegetation types may be attributed to the variations in the quantity and quality of litter input and the soil microbial biomass.

Key words: Cunninghamia lanceolata, Mytilaria laosensis, soil respiration, soil labile organic carbon, tree species

CLC Number:

S714.5
S750

Yu Zaipeng, Huang Zhiqun, Wang Minhuang, Hu Zhenhong, Wan Xiaohua, Liu Ruiqiang, Zheng Lujia. Seasonal Dynamics of Soil Respiration and Its Affecting Factors in Subtropical Mytilaria laosensis and Cunninghamia lanceolata Plantations[J]. Scientia Silvae Sinicae, 2014, 50(8): 7-14.

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Seasonal Dynamics of Soil Respiration and Its Affecting Factors in Subtropical Mytilaria laosensis and Cunninghamia lanceolata Plantations

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